(19)
(11) EP 1 065 240 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.03.2001 Bulletin 2001/12

(43) Date of publication A2:
03.01.2001 Bulletin 2001/01

(21) Application number: 00122232.2

(22) Date of filing: 30.09.1997
(51) International Patent Classification (IPC)7: C08L 23/16
// (C08L23/16, 23:16)
(84) Designated Contracting States:
DE FR GB IT NL

(30) Priority: 30.09.1996 JP 25947096
19.08.1997 JP 22277397

(62) Application number of the earlier application in accordance with Art. 76 EPC:
97116959.4 / 0832926

(71) Applicant: Mitsui Chemicals, Inc.
Tokyo (JP)

(72) Inventors:
  • Kawasaki, Masaaki
    Ichihara-shi, Chiba 299-01 (JP)
  • Koda, Taku
    Ichihara-shi, Chiba 299-01 (JP)
  • Hakuta, Takashi
    Ichihara-shi, Chiba 299-01 (JP)
  • Tojo, Tetsuo
    Ichihara-shi, Chiba 299-01 (JP)

(74) Representative: HOFFMANN - EITLE 
Patent- und Rechtsanwälte Arabellastrasse 4
81925 München
81925 München (DE)

   


(54) Rubber modifier


(57) A rubber modifier which can improve the workability in roll kneading and in extrusion of rubber without deteriorating the material properties of the rubber and which is superior in the performance of handling and working is provided. The rubber modifier comprises an ethylene/α -olefin copolymer rubber (A) composed of one or more copolymers selected from the group consisting of a copolymer of ethylene and an α - olefin having 3 - 20 carbon atoms and a copolymer of ethylene, an α -olefin having 3 - 20 carbon atoms and a non-conjugated polyene, the copolymer rubber (A) having the parameters:





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